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• W2056371140 abstract "Rap1 is a Ras-like GTPase that has been studied with respect to its role in cadherin-based cell adhesion. Rap1 exists as two separate isoforms, Rap1A and Rap1B, which are 95% identical and yet the phenotype of the isoform-specific knockout mice is different. We and others have previously identified a role for Rap1 in regulating endothelial adhesion, junctional integrity, and barrier function; however, these early studies did not distinguish a relative role for each isoform. To dissect the individual contribution of each isoform in regulating the endothelial barrier, we utilized an engineered microRNA-based approach to silence Rap1A, Rap1B, or both, then analyzed barrier properties of the endothelium. Electrical impedance sensing experiments show that Rap1A is the predominant isoform involved in endothelial cell junction formation. Quantification of monolayer integrity by VE-cadherin staining revealed that knockdown of Rap1A, but not Rap1B, increased the number of gaps in the confluent monolayer. This loss of monolayer integrity could be rescued by re-expression of exogenous Rap1A protein. Expression of GFP-tagged Rap1A or 1B revealed quantifiable differences in localization of each isoform, with the junctional pool of Rap1A being greater. The junctional protein AF-6 also co-immunoprecipitates more strongly with expressed GFP-Rap1A. Our results show that Rap1A is the more critical isoform in the context of endothelial barrier function, indicating that some cellular processes differentially utilize Rap1A and 1B isoforms. Studying how Rap1 isoforms differentially regulate EC junctions may thus reveal new targets for developing therapeutic strategies during pathological situations where endothelial barrier disruption leads to disease." @default.
• W2056371140 created "2016-06-24" @default.
• W2056371140 creator A5012885370 @default.
• W2056371140 creator A5052023972 @default.
• W2056371140 creator A5070642099 @default.
• W2056371140 date "2011-03-01" @default.
• W2056371140 modified "2023-10-18" @default.
• W2056371140 title "Isoform-specific differences between Rap1A and Rap1B GTPases in the formation of endothelial cell junctions" @default.
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• W2056371140 doi "https://doi.org/10.4161/sgtp.2.2.15735" @default.
• W2056371140 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3136906" @default.
• W2056371140 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21776404" @default.
• W2056371140 hasPublicationYear "2011" @default.
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